Heat Treated Rice Husk Ash for Steel Insulation
Heat treated rice husk ash is burned at a controlled temperature until the ash is about 90% silica (SiO2), with around 2% carbon and under 1% moisture. Spread on molten steel in ladles and tundishes, the light ash forms an insulating layer that holds heat and keeps the surface from cooling and oxidising. Most of the heat treated rice husk ash exported from Vietnam goes to steel makers in South Korea and Taiwan.
Rice Husk Ash Grades
| Heat Treated | Industrial (Low Carbon) | Agricultural (High Carbon) | |
|---|---|---|---|
| SiO2 | about 90% | 65–75% | 40–55% |
| Carbon | about 2% | 5–10% fixed carbon | 30–40% fixed carbon |
| Moisture | < 1% | ≤ 5% | ≤ 5% |
| Used for | Insulating cover for molten steel in ladles and tundishes | Cement additive, silica source, refractories | Soil amendment, growing media, pH improvement |
Packing and Delivery
Every grade is packed to your request: small bags of 3 to 10 kg for easy handling at the furnace, 25 or 50 kg PP bags, jumbo bags or bulk. Lead time is 3–4 weeks after order confirmation.
